Gang-saw.



PATENIED JAN. 6, 1903.

GANG SAW.

E. E. THOMAS.

APPLICATION FILED MAB.. 31, 1902.

H0 MODEL.

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AIuITED STATES PATENT OEEICE.

EDI/VIN E. THOMAS, OF ST. PAUL, MINNESOTA, ASSIGNOR OF ONE-HALF TO UNION IRON WORKS, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

GANG -SAW.

SPECIFICATION forming partei Letters Patent No. 717,946, dated January c, 1903.

Application filed May 31, 1902. Serial No. 109.628. (No model.)

To all whom t may concern: provided on each side near its ends with lat- Be it known that I, EDWIN E. THOMAS, of @rally-extending lugs 10, that are adapted to St. Paul, Ramsey county, Minnesota, haveinenter slots 11, provided near the ends of the vented certain new and useful Improvements bars 12, which are preferably of castmetal, 55 5 in Gang-SaWs,ofwhich the followingisaspecibrass, bronze, or other suitable material and fication. adapted to fit snugly in the ways and recip- Theinvention relatestosawmillmachinery, :recate therein. The lower ends 0f the bars and particularly to attachmentsforgarng-saws.` are provided with locking-screws 13, that are The saws employed in the machines of this adapted to enter the lugs at the lower end of 6o ro type are rigidly secured in Ia gate that is the gate and lock the barsin position thereon. adapted to slide up and downin ways pro` The upper ends of the bars are hung on the vided in the gang-frame. The saws are placed lugs without being secured thereto. For the under great tension in their support, and the sake of economy in the metal the middle secexpansion of the sides of the gate, owing to its tions of the bars are preferably bpen and their 65 15 rapid reciprocation Vin the ways, will somesides connected by bridges 14, against which times cause breakage of the saws or other the heads of screws 15 are adapted to abut, damage to the working parts of the machine. the opposite ends of said screws entering The primary object, therefore, of myinvenholes in the edges of the gate and provided tion is to provide means in connection with with lock-nuts 16, by means of which the gate 7o zo the reciprocating gate which will takeup the can be easily and conveniently centered beexpansion without affecting the gate or subtween the ways. The upper ends of the bars jecting the saws toa greater strain than origi: not being secured to the lugs on which they nally intended for them. are hungpermit the expansion of the bars Other objects of the invention will appear due to -their rapid reciprocation without in 75 z5 from the following detailed description. any way aecting the lugs or straining the The invention consists generally in a recipgate or the saws, and hence it will makelno rocating saw-gate having suitable ways and dierence at what speed the gate be reciprobars interposed between said ways and gate cated the saws will never be put under any J and connected to the latter, said connections greater Vtension than they are subjected to 8o 3o permitting the expansion of said bars indewhen secured-in the gate.` The bars are finpendently of the gate. ished and have close-fitting joints with the Further, the invention consists in Various ways and slide freely therein and for all pur constructions and combinations, all `as hereposes are a part of the gate itself except when inafter described, and particularly pointed they become heated through the rapid recip- 85 35 out in the claimsl rocation of the gate, when they act inde- In the accompanying drawings, forming pendently thereof and relieve the saws of any part of this specification, Figure 1 is a horipossibility of undue tension being applied to Zontal section of a gang-saw` embodying my them. t At its lower end the gate is provided invention. Fig. 2 is a detail partially in secwith' the usual coupling 17, by means of which 9o 4o tion, showing the manner of supporting the the gate is connected to the operating mechsaw-gate in the ways. Fig. 3 is a longitudianism. (Not shown.) nal section on the line y fy of Fig. 2. I claim as my invention- In the drawings, 2 represents a suitable 1. In a gang-saw, bars supported on the base of timbers whereon the gang-frame 3 is gate between it and the frame and adapted 95 45 supported in the usual manner. Upon the to reciprocate with the gatein the ways, said frame 3 angle-bars rlare bolted, forming ways bars being secured at one end to the gate and 8, between which the saw-gate 9 is vertically supported thereon without being attached slidable. The angle-bars are adjustable tothereto at the opposite end, whereby expanward or from each other, as shown, to regusion of the bars without aii'eeting the gate or ioo 5o late the width of the ways and take up the the tension of the saws is permitted.

wear of the reciprocating bars. The gate is 2. In a gang-saw, the combination, with a saw-gate provided with lugs or projections on its edges, of bars hung on said lugs and secured at one end only and ways wherein said bars are slidable.

3. The combination, with a frame having Ways, of a reciprocating gate provided on each edge with a plurality of laterally-extending lugs, bars having slots to receive said lugs and adapted to reciprocate in said ways and fastening devices for securing said bars at one end only to said lugs.

4. In a gang-saw guide, bars interposed between the saw-gate and frame and secured at one point to said gate and loosely supported thereon at another point, and adapted to reciprocate in the Ways in said frame and to expand Without affecting the gate or the tension of the saws.

5. The combination, with a suitable frame provided with vertical ways, of a reciprocating saw-gate, bars provided in said ways and each normally supported thereon at a plurality of points, and means for securing said bars to said gate at one point only.

6. In a gang-saw, the combination, with a frame provided with suitable ways, of a reciprocating saw-gate, bars provided in said ways and normally supported on said gate at a plurality of points, means for securing each bar to said gate at one point only, and means for centering said gate between said bars.

7. The combination, with a suitable frame having Vertical ways, of a saw-gate provided in its opposite edges near the ends with laterally-extending lugs, and bars adapted to reciprocate in said ways and each having slots to receive said lugs, said bars beingloosely hung on the lugs at one end, and means for securing them to their respective lugs at the other end.

8. The combination, with a suitable frame having vertical ways, of a saw-gate provided in its opposite vertical edges near the top and bottom with laterally-extending lugs, elongated bars adapted to slide in said ways and each having slots near its ends to receive said lugs, said bars being loosely hung on said lugs at their upper ends, and set-screws for securing said bars to their lugs at their lower ends, substantially as described.

In witness whereof I have hereunto set my hand this 27th day of May, 1902.

EDWIN E. THOMAS.

In presence of- RICHARD PAUL, M. C. NooNAN. 

